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  • Al-Najjar, Basim, 1954- (författare)
  • Accuracy, effectiveness and improvement of Vibration-based Maintenance in Paper Mills : Case Studies
  • 2000
  • Ingår i: Journal of Sound and Vibration. - : Elsevier BV. - 0022-460X .- 1095-8568. ; 229:2, s. 389-410
  • Tidskriftsartikel (refereegranskat)abstract
    • Many current vibration-based maintenance (VBM) policies for rolling element bearings do not use as much as possible of their useful lives. Evidence and indications to prolong the bearings’ mean effective lives by using more accurate diagnosis and prognosis are confirmed when faulty bearing installation, faulty machinery design, harsh environmental condition and when a bearing is replaced as soon as its vibration level exceeds the normal. Analysis of data from roller bearings at two paper mills suggests that longer bearing lives can be safely achieved by increasing the accuracy of the vibration data. This paper relates bearing failure modes to the observed vibration spectra and their development patterns over the bearings’ lives. A systematic approach, which describes the objectives and performance of studies in two Swedish paper mills, is presented. Explanations of the mechanisms behind some frequent modes of early failure and ways to avoid them are suggested. It is shown theoretically, and partly confirmed by the analysis of (unfortunately incomplete) data from two paper mills over many years, that accurate prediction of remaining bearing life requires: (a) enough vibration measurements, (b) numerate records of operating conditions, (c) better discrimination between frequencies in the spectrum and (d) correlation of (b) and (c). This is because life prediction depends on precise knowledge of primary, harmonic and side band frequency amplitudes and their development over time. Further, the available data, which are collected from relevant plant activities, can be utilised to perform cyclic improvements in diagnosis, prognosis, experience and economy.
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  • Al-Najjar, Basim, 1954- (författare)
  • Impact of integrated vibration-based maintenance on plant LCC : A case study
  • 2000
  • Ingår i: Quality reliability and maintenance (QRM). - 1860582567 ; , s. 105-109
  • Konferensbidrag (refereegranskat)abstract
    • The biggest thread confronts maintaining high equipment effectiveness is; whether the improved manufacturing processes capable of producing quality products at a competitive cost. The effect of a new vibration-based maintenance concept, Total Quality Maintenance (TQMain), is introduced It aims at making intensive use of real-time data acquisition and analysis to detect causes behind product quality deviation and failures in machinery at an early stage and to allow control of these deviations to improve technical and economic of process effectiveness continuously. The effect of TQMain on machine's LCC and a company's economy is discussed. A case study revealing savings in maintenance cost, when a vibration-based policy is involved is presented
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